<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
div{ width:100px;height:100px;background:red;border:2px black solid;margin:10px ;float:left;}
.box1{width:100px;height:100px;background:blue;float:left;}
/* margin :0 auto margin-left:auto;margin-right:auto; auto复合写法  0上下的距离*/
.bigbox{width:110px;height:300px;border:2px black solid;}
</style>
</head>

<body>

<div>GGGGGGGGGG</div>

<div class="box1">GGGGGGGGG</div>

</body>
</html>
